Improvement in bit-stocks



UNITED' STATES CLEMENS VB. ROSE, OF .MILLERS FALLS, vMASSACHUSETTS 5 BOWDOIN S.

PATENT OFFICE.

PARKER, ADMINISTRATOR.

IMPROVEMENT IN BlT-sTocKs.

Specification forming part of Letters Patent No. 192,0 l S, dated June l2, 1877; application filed October 28, 1876.

To all lwhom it mag/vcoucera:

Re it known that I, GLEMENS B. ROSE, of Millers Falls, in the county of Franklinand State of Massachusetts, have invented a new and valuable Improvement in, Bit-Stocks; and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being had to the annexed drawings, making a part of this specification, and to the letters and gures of reference marked thereon.

Figure 1 of the drawings is a representation of a plan view, part section; and Fig.2 is a plan view of the same. Fig. 3 is a detail view. Fig. 4 is a longitudinal vertical sectional view of my ratchet forbit-stocks; and Figs. 5, 6, and? are detail views thereof.`

This invention relates to bit-stocks for ratchet-drills and braces; and it consists in certain improvements therein, as will be hereinafter more fully set forth; n

In'the annexed drawings, A designates a stock or shaft, which is adapted to receive in its lowerend any form of bit or` similar tool,

. and B designates a cylindrical header block formed on the upper end ot' said stock, as shownin Fig. 5. Said head or block is re cessed on its sides at b b, to allow the inward and outward movement of pawls or dogs C C, which are pivoted by their rear ends to the bottom of said recesses, so as to be capable of `vibrating inward and outward. In said disk, in the larger side of each one of said recesses, is a small socket, c, which receives one end of a helical spring, I),vthat operates to `force outward the free end of one of said pawls or dogs C C. The shape of said recesses b b and sockets c c and the arrangement of the parts above described are shown in Fig. l.

E designates the handle of a ratchet-drill, which terminatesin an annular ratchet-casin g, F. Said casing is cup-shaped, with a perforated bottomLso as to surround the head or block B, the upper end of stock A and the pawls or dogs C (l conforming 'accurately to the shapes of said parts and the positions assumed when in operation.` Said lannular casing is prevented fromslipping down upon stock A by means of short pins or studs a a, projecting from said stock at the point reached by the lower edgeof said casing. Said casing is also prevented from slipping off the upp'erend of said stock by means of shoulders f j' on the inside of said casing, which shoulders catch under said head or bleek B. The construction of saidratchet-casing F is distinctly shown in Fig. 4t.

G Gr in Figs. l, 2, and 4 designate ratchetteeth or lugs formed on the inner surface of casing F, at the top thereof, and adapted to engage with one or the other, or both, of said dogs or pawls C C vwhen the latter are thrown into position for such engagement. One of said pawls, when interlocking with one of teeth Gr, causes stock A to turn with handle 'E as one piece when the said handle is turnedto the right, while allowing said handle and casing F to tnrn freely upon said stock A and disk B in the opposite direction.. The other pawl or d og in like manner locks the said devices together when turned to the left, but leaves stock A stationary when handle E is turned to the right. When both of said pawls O C are turned outwardL the devices are locked together, whichever way the said handle is turned. Each one of ratchetteeth or lugs Gr faces both ways, so as to engage with either one of said dogs O.

` Each one of said dogs or lugs is provided on top, near its outer end, with a pin or stud, c', shown distinctly in Fig. 3. These studs or pins c c enter cam slots or recesses h h in the under side of a regulating cap or shield, H, which is secured to the top of disk B by means of a screw, or its equivalent, passing down through a'central perforation, h1, in said shield. Said shield serves both to protect the pawl and ratchet devices hereinbei'ore described and to throw out of engagement either one ofV said pawls. This is eifected by turning said regulating-shield to the right or left, as the case may be. By so turning it the material of said shield H on the outer side h2 of i one of said slots or recesses `h will press against one of said pins, and thus force inward one of said pivoted dogs. By-turning said shield the other way the other pawl or dog will be similarlyV operated on. This oper ation is produced by the peculiar shape ofthe slots or recesses h, each one of which is nanl row at one end and broad at the other, the above-mentioned narrowing being effected by extending the material of shield H inward from the outer side of said slot, and at one end thereof. Shield H is circumferentially milled at H', as shown in Fig. 7, for the purpose of enabling` said shield to be easily turned by the fingers. Fig. 6 shows the form of recesses or slots h h above described..

t E may be, instead of a straight ratchetdrill handle, the crank of a crank-brace. Any other form of brace or its equivalent may be used with the devices herein before described.

What I claim as new, and desire to secure by Letters Patent, is-

Recessed disk B, in combination with pivoteddogs or pawls U C, having pins c c', and springs D D, substantially as set forth.

In testimony that I claim the above I have hereunto subscribed my name inthe presence of two witnesses.

CLEMENS B. ROSE.

Witnesses:

O. I. WRIGHT, W. H. BRIZZELL. 

